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Chinese Journal of Biological Control ›› 2021, Vol. 37 ›› Issue (3): 451-458.DOI: 10.16409/j.cnki.2095-039x.2021.01.021

• RESEARCH REPORTS • Previous Articles    

Population Dynamics of Orius similis and Thrips flavus and Predatory Function Response

SUN Ying1, HU Changxiong1, WU Daohui1, CHEN Guohua1, YIN Honghui2, XU Tianyang2, CHEN Ting3, ZHANG Xiaoming1   

  1. 1. College of Plant Protection of Yunnan Agricultural University/State Key Laboratory of Yunnan Biological Resources Protection and Utilization, Kunming 650201, China;
    2. Wenshan Branch of Yunnan Tobacco Company, Wenshan 663000, China;
    3. Institute of Plant Protection, Guangdong Academy of Agricultural Sciences/Key Laboratory of New Technology of Plant Protection, Guangzhou 510640, China
  • Received:2020-07-20 Published:2021-06-16

Abstract: To clarify the occurrence of Orius similis and Thrips flavus on Vicia faba, and the predation ability of O. similisto thrips under indoor conditions. The population density of T. flavus and its natural enemy O. similis were investigated on V. faba plants by using five point sampling method in this experiment. Meanwhile, the predatory function and searching effect of female adults O. similis to T. flavus adults and 2nd instar nymphs were studied. The results showed that the population density of thrips peaked at 18.2 ind. per plant in early March, and the peak population densities of O. similis was occurred 19 days later than that of T. flavus, reached at peak densites of 3.4 ind. per plant in mid-March. The predation effect of O. similis to T. flavus was affected by both T. flavus and O. similis densities, which was in accordance with Holling II disk equation functional response model. The predatory function corresponding equations of O. similis on adults thrips and 2nd instar nymphs were Na=0.5655N/(1+0.0193N) and Na=1.1864N/(1+0.0346N), respectively; the maximum daily predation was 29.3 ind. per day and 34.3 ind. per day, respectively. The predation of adults O. similis to T. flavus was disturbed by O. similis density, and the average food intake decreased, and the interference response equation was E=0.3009P-0.4290when the prey density was fixed. The population of O. similis to T. flavus had the following phenomenon on V. faba in the field, and the population densities were increased with the increase of T. flavus. The population number of T. flavus reached the peak densities during the flowering stage on V. faba from February to March, meanwhile, the O. similis population has strong predatory ability to T. flavus, which could be used as an important natural enemy resource in T. flavus biological control practice.

Key words: Thrips flavus, Orius similis, predatory functional, population dynamics, biological control

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